Left 4 Dead is set in the immediate aftermath of the zombie apocalypse. You and your fellow survivors must battle thousands of swarming zombies as you travel across the rooftops of an abandoned metropolis, through rural ghost towns and pitch-black forests. Left 4 Dead also features a Versus mode that allows you to play as the Boss Zombies.
New technology dubbed "the AI Director" is used to generate a unique gameplay experience every time you play. The Director tailors the frequency and ferocity of the zombie attacks to your performance, adjusting pacing, special effects and audio on the fly.
You can win a copy of Left 4 Dead for the Xbox 360 (features single player, co-op and multiplayer game modes).
Just answer this question:
What is a zombie's favourite food?
a) Pizza
b) Brains
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Check out the official site here.